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neovim-flake/lib/lua.nix

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Nix

# Helpers for converting values to lua
{lib}: let
inherit (lib) mapAttrsToList filterAttrs concatStringsSep concatMapStringsSep stringToCharacters boolToString;
inherit (builtins) hasAttr head throw typeOf;
in rec {
# Convert a null value to lua's nil
nullString = value:
if value == null
then "nil"
else "'${value}'";
# convert an expression to lua
expToLua = exp:
if builtins.isList exp
then listToLuaTable exp # if list, convert to lua table
else if builtins.isAttrs exp
then attrsetToLuaTable exp # if attrs, convert to table
else if builtins.isBool exp
then lib.boolToString exp # if bool, convert to string
else if builtins.isInt exp
then builtins.toString exp # if int, convert to string
else if exp == null
then "nil"
else (builtins.toJSON exp); # otherwise jsonify the value and print as is
# convert list to a lua table
listToLuaTable = list:
"{ " + (builtins.concatStringsSep ", " (map expToLua list)) + " }";
# convert attrset to a lua table
attrsetToLuaTable = attrset:
"{ "
+ (
builtins.concatStringsSep ", "
(
lib.mapAttrsToList (
name: value:
name
+ " = "
+ (expToLua value)
)
attrset
)
)
+ " }";
# Convert a list of lua expressions to a lua table. The difference to listToLuaTable is that the elements here are expected to be lua expressions already, whereas listToLuaTable converts from nix types to lua first
luaTable = items: ''{${builtins.concatStringsSep "," items}}'';
toLuaObject = args:
if builtins.isAttrs args
then
if hasAttr "__raw" args
then args.__raw
else if hasAttr "__empty" args
then "{ }"
else
"{"
+ (concatStringsSep ","
(mapAttrsToList
(n: v:
if head (stringToCharacters n) == "@"
then toLuaObject v
else "[${toLuaObject n}] = " + (toLuaObject v))
(filterAttrs
(
_: v:
(v != null) && (toLuaObject v != "{}")
)
args)))
+ "}"
else if builtins.isList args
then "{" + concatMapStringsSep "," toLuaObject args + "}"
else if builtins.isString args
then
# This should be enough!
builtins.toJSON args
else if builtins.isPath args
then builtins.toJSON (toString args)
else if builtins.isBool args
then "${boolToString args}"
else if builtins.isFloat args
then "${toString args}"
else if builtins.isInt args
then "${toString args}"
else if (args == null)
then "nil"
else throw "could not convert object of type `${typeOf args}` to lua object";
}